Composition last and process of making same.



APPLICATION FILED NOV. 7,1914.

Patented Mar. 14,1916.

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diff/ MM. 4.,

UNITED STATES PATENT OFFICE.

WALTER 1c FREEMAN, or osoAwANa, nEwYonK, ASSIGNOR T0 HYnnoLosE rnocnss CORPORATION, A CORPORATION or NEW YORK.

COMPOSITION LAST AND PROCESS OF MAKING SAME.

License.

Specification of Letters Patent.

Patented Mar. 14, 1916,.

Application filed N0vember'7, 1914. Serial No. 870,880.

To aZZ'whom it may concern:

vState of New York, have invented certain new and useful Improvements in Composition Lasts and Processes of Making Same; and I dohereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to make and use the same.

My invention relates to. composition lasts that if the wood derivatives were to be rep and the method of making the same, and the object of the invention is to produce a last which is superior to the wood or metal lasts now used, and which can be more readily made and at less cost.

A further, object of the invention is to produce a last especially adapted for use in vulcanizing rubber foot wear, and to this vend, i'nmaking the lasts, I utilize the wood derivatives recovered from thesulfite waste liquor of wood pulp mills.

, In vulcanizing rubber foot wear, considerable trouble is experienced with wood lasts on account of the warping properties i of the wood and its liability to absorb mOlS- ture, and trouble is likewise experienced in the use of metal lasts due to the expansion of the metal in the vulcanizing process. In vulcanizing rubber goods, the rubber is coated on a fabric over the lasts or "other forms, which are then mounted on frames and placed in the vulcanizing chamber. On account of the heat to which-the lasts are subjected in this chamber, a certain percentage of the rubbers are re'ndereddefective,

[due to the warping of the wood lasts and the expansion of the metal lasts, causing blisters or loosening of the rubber from the fabric, or theseparation ofthe rubber at a seam, etc. And it is therefore desirable to provide a last which'will not be aifec'ted by moisture or'the increase in temperature within the limits of this process.

Lasts made in accordance with my invention are light in weight, fire and moistureproof within the limits of the vulcanizing treatment, and will not warp or expand during the treatment. The use of such a last therefore greatly reduces the percentage of defective rubber articles resulting from the vulcanizing process.

covered and separated from the sulfurous acid and calcium constituents of the liquor, the liquor was first treated with a chlorid or with a coagulating agent and then treate ed with a suitable precipitant as barium chlorid to effect precipitation of the, sulfur compounds of the liquor, after which the syrupy mass containing the wood derivatives of the liquor was drawn off from the precipitate and then bleached if desired, and

evaporated down to an anhydrous mass and ground into powder. :1 termed this recovered substance containing the wood derivatives separated from the precipitates,-

whether in the syrupy or powdered state,

xylozo. It was also pointed out that it v the wood derivatives and treated sulfurous acid and calcium ingredients were to'be separated from the liquid part or xylozo as a separate product, or precipitate, I applied to this product or precipitate the term xylosca. p In this specification, I will use the terms xylium, xylosca and xylozol in the sense stated, to designate the neutralized products recovered from the sulfite waste Xylium, therefore, 1s a general liquor. expression, since it means the compound which contains both the'potential derivatit-"es xylozo and xyloscatl' I may substitute for the complete xylium in whole or in part, either xylozo or xylosca, the former having a tendencyto increase resiliency and the latter to increase toughness in the' product," and I wish the term xylium to include modifications as indicated.

In order that thoseskilled in the art may thoroughly understand my invention and the method of carrying out the same, I will describe in detail what I believe tobe the best method nowknown to me of making my new composition last. I first take suitable finely disintegrated inactive matter, preferably dry disintegrated wood or other finely divided fibrous material, and treat it with a suitable oxy-chlorid to effect-induration. This is preferably done by wetting the disintegrated matter with a solution of a metal chlorid such as magnesium chlorid of a suitable strength, say 15 Baum, and then mixing the coated material with a suitable powdered metal oxid such as magnesium oxid sufficient to thoroughly coat the minute particles of wood, and then permitting the mixture to dry out to effect thorough induration of the mass. I then thoroughly mix together as by grinding a suitable quantity of disintegrated xylium and a suitable dry metallic oxid and chlorid such as magnesium oxid and chlorid, and to the resulting' powder I mix a suitable quantity of the finely disintegrated indurated wood or other inert matter. This mixture is then wetted' with water or a weak solution of a suitable.

metal chlorid to reduce it to a stilt plastic mass in which form it may be pressed into suitable molds to form hollow or solid lasts as desired.

I have found in practice that the proportion of the different ingredients may be considerably varied according to the qualitypf the last desired, but a very satisfactory last has been made froma mixture containing the following proportion of ingredients: Approximately 50 parts by weight of dry xylium, approximately 50 parts by weight of magnesium oxid, approximately 25 parts by weight of magnesium chlorid, and approximately 4.5 parts by weight of finely disintegrated wood which is treated with magnesium oxy-chlorid to indurate it. After this disclosure of my invention it will be obvious to those skilled in the art that'certain changes and substitutions may be made in carrying out my invention without departing from the spirit thereof. For instance, the finely disintegrated indurated wood may be ground up together with the other ingredients, or the different ingredients may. be mixed in separately to form the powdered mixture and if desired the metallic chlorid may be added in the form of so lution of suitable strength to insure the proper amount of the chlorid to effect with the oxid the bonding action. and likewise if desired any suitable metallic oxy-chlorid such as zinc, barium or aluminum oxychlorid, or any suitablei compound oxy-chlorid may be used in place of a magnesium oxy-chlorid.

Figures 1 and 2 are respectively longitudinal sections showing thehollow and solid lasts in the molds.

In Fig. 1, 1 is a suitable metal mold in which has been placed a paraffin form or core 2, having projecting pegs 3 and 4 to properly support it within the mold, leaving a space between the core and the metal mold depending upon the thickness of the desired last. This paraffin core also has two upper projections 5, the purpose of which is to form two holes in the upper part of the hollow last through which pins may be forced to hold the last in place on suitable racks during the vulcanizing process. The plastic mixture is pressed into the moldthrough the opening 6 in any suitable way such 'as' by compressed air, and after the mixture is thoroughly packed around the space between the ccre and the'mold and allowed to stand until chemical action has set in and the form hardened sufficiently to retain its shape, it may be removed from the mold and further dried, and the paraflin core melted out through the o enings 'formed by the pegs 3, 4: and 5. I it is desired to form a solid last the plastic mixture is forced through the opening 6', as above described in connection with Fig. 1, under pressure sufficient to insure the complete 'filling of the Inoldand the elimination of'any possible air bubbles, after which the last may be allowed to partially dry and then removed from the mold. v

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A composition last containing asubstantial amount of xylium and a bond of oxy-chlorid cement.

2. A composition last containing a substantial amount of xylium, dis integrated hard vegetable matter,and a bond of oxychlorid cement.

3.-A composition last containing. a substantial amount of xylium, finely disintegrated indurated matter .and a bond of oxy-chlorid cement.

4. A composition last containing a substantial amount of intimately mixed powdered xylium and. suitable finely disintegrated fibrous material held together by a suitable bond of oxy-chlorid cement.

5. A composition last containing a substantial amount of hardened xylium intimately mixed with disintegrated indurated hard vegetable matter, compounded with and held together by a bond of oxy-chlorid cement.

6. A composition last containing a substantial'amount of powdered xylium, dry disintegrated wood and a bond of oxychlorid cement. v

7. A composition last containing, intimately inixedg a substantial amount of powdered xylium and finely disintegrated xylium derivatives, disintegrated indurated fibrous material, and a small amount of inert material.

9. The method of making a composition last which consists in intimately mixing xylium finely disintegrated fibrous material, and a suitable oxy-chlorid, forcing the mixture in a mold under pressure while in a stifi plastic state, and allowing it to dry.

10. The method of making a composition last or similar article, which consists in treating disintegrated Wood with a suitable oxy-chlorid to indurate the same, finely dis- In testimony whereof I affix my signaturein the presence of two subscribing witnesses WALTER K. FREEMAN.

WVitnesses:

JNO. S. GEORGE, CLARENCE W. HODGE.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patenta, Washington, D. 0." 

